Sunspot positions, areas, and group tilt angles for 1611-1631 from observations by Christoph Scheiner
- Methods. In most cases, the given orientation of the ecliptic is used to set up the heliographic coordinate system for the drawings. Positions and sizes are measured manually on screen. Very early drawings have no indication of their orientation. A rotational matching using common spots of adjacent days is used in some cases, while in other cases, the assumption that images were aligned with a zenith-horizon coordinate system appeared to be the most probable.
| Author details: | Rainer ArltGND, Senthamizh Pavai ValliappanORCiD, C. Schmiel, F. Spada |
|---|---|
| DOI: | https://doi.org/10.1051/0004-6361/201629000 |
| ISSN: | 1432-0746 |
| Title of parent work (English): | Mountain research and development |
| Publisher: | EDP Sciences |
| Place of publishing: | Les Ulis |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2016 |
| Publication year: | 2016 |
| Release date: | 2020/03/22 |
| Tag: | Sun: activity; history and philosophy of astronomy; sunspots |
| Volume: | 595 |
| Number of pages: | 10 |
| Funding institution: | Deutsche Forschungsgemeinschaft [Ar 355/10-1] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
